I got a md-254 (sitecom) and having problems loading my saved playlists to the xbox360.What does this mean?

On the Xbox I select Music Libary - Twonkey server - select playlists.My Xbox wont find the playlists at firstThen i push further and the xbox will build a playlistWhen going back and chose to select playlists again, it will find my playlists!!! thats strange...

On my older md-253 with twonkey 4.4.9 i didnt had this problem and i could chose my playlists right away.

You are correct. Xbox 360 only works with the advanced tree view. This is because of how Xbox works. And yes, it's not a good thing. This also explains why not all of the normal items in the advanced tree are present.